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I have the HK one. Works fine for 1/8 shaft stuff. I have pulled a 5mm bore pinion with it but wouldn't recommend doing so often - it worked but the threads began to fold.
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If I use these bearings for my drum are they likely to just explode on impact?
http://simplybearings.co.uk/shop/p15...duct_info.htmlComment
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I would go for a self aligning double row bearing e.g.
http://bearingsdirect.com/22200-seri...-25x52x18.htmlComment
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Wouldn't bother with the fancy bearings. The ones you linked should be fine and get the job done. Sure they may need replacing after an event or two but having a spare in the toolbox isn't going to break the bank.
It always seems to be the shaft that ends up going on drums or the drum itself rather than the bearings.Comment
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2 pneumatic questions:
1) Can a 3/2 valve be used 'backwards' so that a gas supply can be connected to one side then be switched to supply either one of two rams? (Obviously the gas wouldn't be dumped after an activation of either ram but this isn't a problem)
2) Does anyone know of an affordable 3/2 valve rated for full pressure (ie at least 1000psi)?
Thanks!Comment
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Depends on type of 3/2 valve. Normal low pressure valves can be used in reverse.
No, I don't know on any affordable, light 3/2 valves that can handle FP gas.Comment
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Hey,
Haven't had any progress in a long time as I've been really busy with Uni, but I'm going to try my best to make some progress on my featherweight drumbot to get it finished.
Had a question about the Red Brick ESCs, so a small per usual I'be made the robot a bit too small and there's not much space for all the electronics, just wondering if anything can be done about the big capacitor sticking out of the end of the red brick, has anyone attempted to remove it? Is it needed for our application, and if so has anyone tried to move it to somewhere else in the system?Comment
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Big capacitors between the battery leads are usually to prevent some kind of excessive change in current I believe, or to smooth input. The circuit might work without, but probably less reliably, or it might break more easily.Comment
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I've found myself with a bit of spare time so have gone and entered my drumbot into the DRG FACTS event, now I've just got the small matter of finishing the robot!
I'm trying to work out how to run power from the brushless to the drum, unfortunately I've left myself with no way of getting a 'closed' belt like a timing belt on there so need a belt that comes split and can be joined in-situ. The best option I've found is polyurethane round belts like these: https://www.ebay.co.uk/itm/Orange-Sm...8AAOSwkShY9oGn
But I'm not sure how many/what diameter to use, has anyone with experience with these belts got any suggestions? I was thinking maybe 3no. 5mm diameter belts?Comment
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Can't comment in the drum drive, but I've used split fan belts on cars before now, but only ever as a roadside repair, that said I don't see why they wouldn't work so long as you can tension it properly.
Is there no way you could remove the drum to fit a belt? Personally I'd feel better entering an arena with a one piece belt, but I'm and ardent over-engineerer(erer) haComment
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